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Originally Posted by blackhole
I dunno about that... 36 lbs is 36 lbs, whether air, nitrogen, helium or sand.
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Fail, terrible fail. You didn't happen to write the rules for the NFL and their football inflation?
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The ball shall be made up of an inflated (12 1/2 to 13 1/2 pounds) urethane bladder enclosed in a pebbled grain, leather case (natural tan color) without any corrugations of any kind.
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Gasses have different thermal properties. The biggest factor in using air is the amount of water. I fill my tires with scuba air which is very very dry compared most compressor air.